Abstract
WITH increasing use of chromatographic columns, the need has arisen for automatic fraction-cutting apparatus. Stein and Stanford Moore1 have devised such an apparatus in which the fraction is measured photo-electrically and the battery of receivers then moved on by an electric motor. Randall and Martin2 have recently described an ingenious mechanical fraction-cutter in which an intermittent siphon cuts the fractions. The weight of the fraction operates an escapement, bringing the siphon opposite the next receiver, the rack of receivers being stationary. In the apparatus described here, the receiver, which is depressed by the weight of the fraction, acts as the escapement. Randall and Martin used the torque of a twisted string to move the siphon delivery tube, and this idea has been copied here to move the whole rack of tubes.
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PHILLIPS, D. A Simple Automatic Fraction-Cutter for Liquid Columns. Nature 164, 545 (1949). https://doi.org/10.1038/164545a0
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DOI: https://doi.org/10.1038/164545a0
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